package com.itheima.filter;

import com.alibaba.fastjson.JSON;
import com.itheima.reggie.common.BaseContext;
import com.itheima.reggie.common.R;
import lombok.extern.slf4j.Slf4j;
import org.springframework.util.AntPathMatcher;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

@Slf4j
@WebFilter(filterName = "loginCheckFilter", urlPatterns = "/*")
public class LoginCheckFilter implements Filter {
    //路径匹配器，支持通配符
    public static final AntPathMatcher PATH_MATCHER = new AntPathMatcher();

    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain)
            throws IOException, ServletException {
        HttpServletRequest request = (HttpServletRequest) servletRequest;
        HttpServletResponse response = (HttpServletResponse) servletResponse;
        //获取本次请求uri
        String uri = request.getRequestURI();
        //打印日志
        log.info("拦截到请求{}", uri);
        //定义不处理的路径
        String[] urls = new String[]{
                "/employee/login",
                "/employee/logout",
                "/backend/**",
                "/front/**",
                "/common/**",
                "/user/login",
                "/user/sendMsg"
        };

        //判断本次请求是否需要处理
        boolean check = check(urls, uri);
        if (check) {
            log.info("{}请求不需要处理", uri);
            filterChain.doFilter(request, response);
            return;
        }

        //判断登录状态，如果已登录就放行(电脑网页版)
        if (request.getSession().getAttribute("employee") != null) {
            log.info("用户已登录，id为{}", request.getSession().getAttribute("employee"));
            Long o = (Long) request.getSession().getAttribute("employee");
            BaseContext.setCurrentId(o);
            filterChain.doFilter(request,response);
            return;
        }
        //判断登录状态，如果已登录就放行(手机网页版)
        if (request.getSession().getAttribute("user")!=null){
            log.info("用户已登录，id为{}", request.getSession().getAttribute("user"));
            Long user = (Long) request.getSession().getAttribute("user");
            BaseContext.setCurrentId(user);
            filterChain.doFilter(request,response);
            return;
        }

        //如果未登录
        response.getWriter().write(JSON.toJSONString(R.error("NOTLOGIN")));
        return;
    }

    private boolean check(String[] urls, String uri) {
        for (String url : urls) {
            if (PATH_MATCHER.match(url, uri)) {
                return true;
            }
        }
        return false;
    }
}



